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(No Model.) I 2Sheets--Sheet l.

L. 8L A. Y. GRAY. Thrashng Machine.

Patented March 8,1881.

UWE/v TO/eg,

A NORA/EY WTNESSES:

(No Model.) 2 SheetS--Shet 2 'L. & A. Y. GRAY. Thrashng. Machine.

No. 238,748. Patented'lvlarch 8,1881.

, ATTO/e@ WTNESSES:

MPETERS. PHOTO-LITNOGRAFH EB. WASHiNGYON, D C.

UNTTED STATES PATENT OFFICE.

LEONIDAS GRAY AND ALBERT Y. GRAY, OF MIDDLETOWN SPRINGS, YT.

TH RASHING-MACHINE.

SPECIFICATION forming' part of Letters Patent No.y 238,748, dated March 8, 1881.

Application led March 13, 1880. (No model.)

To all whom t may concern:

y Be it known that we, LEONIDAS GRAY and ALBERT Y. GRAY, of Middletown Springs, in the county of Rutland and State of Vermont, have invented Improvements in Thrashing- Machines, of which the following is a description, reference `being had to the accompanying drawings, forming part ot' this specification, Wherein- Figure l is a side elevation of the feeding end of a thrashing-machine embodying our invention, the upper case or cover being in section. Fig. 2 is a transverse vertical section ot' the same. Fig. 3 is a longitudinal vertical section, and Fig. 4 is a plan, of the toothed cylinder.

Our improvements relate to the cylinders of thrashing-machines; and they consistin the peculiar construction and combination of parts hereinafter specilied and claimed.

In carrying our invention into eiect we forni the cylinder with two flanged metallic heads mounted on a shaft. Said heads are united by an encircling metallic plate, which forms the periphery ot' the cylinder, such plate being of suflcient thickness to support the shoulders of the teeth or spikes without bending. rlhis cylindrical plate is backed by a wooden lining, which gives a bearing to and supports the teeth, and also acts as a spring to prevent the nuts which hold the teeth in place from working loose when the machine is in operation. The concave is also constructed of a heavy metal plate with wooden lining or backing. The teeth of both the cylinder and the concave are formed with shoulders, which rest against the metal plate, and

with threaded Shanks, which pass through the wooden backing and are held fast in position by nuts or burrs.

Referring to the accompanying drawings, A

indicates the frame of the forward or feeding end of a thrashing-machine.

B represents the cylinder, and C the concave.

The cylinder is tormedwith two metal heads, b l), mounted on a shaft, b. Said heads are united by a stout metal plate, B, which forms the shell of the cylinder. Back or inside of said shell, and between it and annular flanges b2 b2, formed on the heads b b', is a wooden lining, D, of sufficient thickness to allow ample bearing for the Shanks of the teeth or spikes E. Said wooden lining supports or braces the shell, gives a long bearing for the teeth, and operates as a spring to prevent the nuts on the teeth from working loose. The metallic heads b b serve to hold the wood lining in position, and also to preserve a true circular form for the cylinder.

The teeth E are formed with shoulders e, which rest against the metal plate or shell B', and with threaded shanks e. which pass backwardly through the wood lining and Ireceive nuts or burrs e2."

The concave consists ot" a thick metal plate, C', with wooden lining C2, and is provided with teeth F, similar in construction to the teeth E.

The shell Bl is a continuous plate, whose ends overlap and are riveted together, as shown at b3, and both it and the concave plate C should be ofsuflicient thicknessand strength to support the shoulders of the teeth without bending or dinting when stones or other hard material entering the machine come in contact with such teeth.

lThe heads b b are made as open as possible, (and to this end consist each of a hub, radial arms, and rim,) so as to permit the easy introduction all around the inside of the cylinder ot' a wrench for screwing and unscrewing the nuts on the teeth.

What we claim as our invention isl. Ina thrashing-cylinder, the shell B consisting of a single metallic plate of cylindrical form, and ot' sufficient thickness to support the shoulders of the teeth without bending, in combination with the hollow wooden lining or backing, the shouldered teeth having threaded Shanks, and the nuts e2, fastened thereon inside the cylinder, substantially as set forth.

2. The combination, in a thrashing-cylinder, of the flanged metallic heads b b, the shell or plate B', and wooden lining D, said shell or plate being formed in one single piece and fastened directly to the heads, substantially as shown and described.

In testimony that we claim the foregoing we have hereunto set our hands this 8th day ot' March, 1880.

LEONIDAS GRAY. ALBERT Y. GRAY. Witnesses:

A. A. GREENE, W. G. CoNoLLv.

IOO 

